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9. TROUBLESHOOTING
Phenomena Checkpoint Estimated cause Action
The servo motor
vibrates.
Check the mounting accuracy of
the servo motor and the machine.
The eccentricity is big by the core
gaps.
Review the direct connection
accuracy.
Check the axial end load on the
servo motor.
The axial end load on the servo motor
is large.
Adjust the axial end load within the
specifications of the servo motor.
Refer to Servo motor Instruction
Manual (Vol.2) for details of the
axial end load on the servo motor.
Check the vibration from the
outside.
The outside vibration propagated to
the servo motor.
Control the vibration from the
outside source.
Rotation accuracy
is not satisfactory.
(The speed is
unstable.)
1. If the safe operation is possible,
repeat acceleration/deceleration
4 times or more to complete the
auto tuning.
2. Increase the auto tuning
response (parameter No.PA09).
(except the manual mode)
1. The servo gain is low.
2. The auto tuning response is low.
Increase the auto tuning response
and then adjust the gains again.
(Refer to chapter 7.)
Check if the limiting torque (TLC)
is not on.
1. Check with the external I/O
signal display in the diagnostic
mode.
2. Check the torque ripple with the
"I/O interface display" command
on the "Monitor" menu on MR
Configurator.
Unintended torque limit is valid. (The
torque limit (TLC) is on while the
torque limit is valid.)
Release the torque limit.
Check if the maximum torque does
not exceed the torque limit value.
1. Check "instantaneous torque"
on the status display.
2. Check the torque ripple with the
"Graph" command on the
"Monitor" menu on MR
Configurator.
The maximum torque is lacking.
1. The servo capacity is lacking.
2. The load is too large.
1. Change the mass or the shape of
the work to reduce the load.
2. Make the acceleration/
deceleration time shorter to make
the effective load ratio lower.
The torque limit settings are incorrect.
(Set with the parameter No.PA11/
PA12/PC35.)
Review the torque limit setting.
Check the status of the analog
input voltage.
1. Check with the status display.
2. Check with the "Display all"
command on the "Monitor"
menu on MR Configurator.
Input voltage of the analog speed
command (VC) or the analog speed
limit (VLA) is instable.
Review the settings of the analog
speed command (VC), the analog
speed limit (VLA) and the analog
input voltage.
Check commands from the
controller.
Check the ripple of the command
frequency with the "Graph"
command on the "Monitor" menu
on MR Configurator.
Commands from the controller are
unstable.
1. Review the commands from the
controller.
2. Check the command cable if
errors do not occur such as
breaking.
The servo motor
wobbles at stop.
1. If the safe operation is possible,
repeat acceleration/deceleration
4 times or more to complete the
auto tuning.
2. Increase the auto tuning
response (parameter No.PA09).
(except the manual mode)
1. The servo gain is low.
2. The auto tuning response is low.
Increase the auto tuning response
and then adjust the gains again.
(Refer to chapter 7.)